Hello,
i'm try to design AC/DC controller with pfc controller. I use ucc28070pw controller. I make a prototype and meet a problem.
1 ) when disconnect to load pfc run correctly input: 115 VAC output: 400 VDC but when connect pfc to load and draw curent output voltage dicrease to 160 VDC.
controller doesn't increase duty cycle range in my opinion controller behave like over current protectiopn.
Actually i use TI application note for referance design.
attached file you can see design files. UCC28070_Sematic.pdfUCC28070_Sematic2.pdfCan you please have look design shematic and guide me about current sensing.